There are several extra things that have to be considered when running
Domain Validation on a u320 target (notably how you fall back).
Hopefully this should help us when someone adds this transport class to
aic79xx.
I've tested this on the lsi1030, so I know it works correctly up to
u320.
James
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -669,6 +669,7 @@ spi_dv_retrain(struct scsi_request *sreq
{
struct spi_internal *i = to_spi_internal(sreq->sr_host->transportt);
struct scsi_device *sdev = sreq->sr_device;
+ struct scsi_target *starget = sdev->sdev_target;
int period = 0, prevperiod = 0;
enum spi_compare_returns retval;
@@ -682,24 +683,40 @@ spi_dv_retrain(struct scsi_request *sreq
break;
/* OK, retrain, fallback */
+ if (i->f->get_iu)
+ i->f->get_iu(starget);
+ if (i->f->get_qas)
+ i->f->get_qas(starget);
if (i->f->get_period)
i->f->get_period(sdev->sdev_target);
- newperiod = spi_period(sdev->sdev_target);
- period = newperiod > period ? newperiod : period;
- if (period < 0x0d)
- period++;
- else
- period += period >> 1;
-
- if (unlikely(period > 0xff || period == prevperiod)) {
- /* Total failure; set to async and return */
- SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Domain Validation Failure, dropping back to Asynchronous\n");
- DV_SET(offset, 0);
- return SPI_COMPARE_FAILURE;
+
+ /* Here's the fallback sequence; first try turning off
+ * IU, then QAS (if we can control them), then finally
+ * fall down the periods */
+ if (i->f->set_iu && spi_iu(starget)) {
+ SPI_PRINTK(starget, KERN_ERR, "Domain Validation Disabing Information Units\n");
+ DV_SET(iu, 0);
+ } else if (i->f->set_qas && spi_qas(starget)) {
+ SPI_PRINTK(starget, KERN_ERR, "Domain Validation Disabing Quick Arbitration and Selection\n");
+ DV_SET(qas, 0);
+ } else {
+ newperiod = spi_period(starget);
+ period = newperiod > period ? newperiod : period;
+ if (period < 0x0d)
+ period++;
+ else
+ period += period >> 1;
+
+ if (unlikely(period > 0xff || period == prevperiod)) {
+ /* Total failure; set to async and return */
+ SPI_PRINTK(starget, KERN_ERR, "Domain Validation Failure, dropping back to Asynchronous\n");
+ DV_SET(offset, 0);
+ return SPI_COMPARE_FAILURE;
+ }
+ SPI_PRINTK(starget, KERN_ERR, "Domain Validation detected failure, dropping back\n");
+ DV_SET(period, period);
+ prevperiod = period;
}
- SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Domain Validation detected failure, dropping back\n");
- DV_SET(period, period);
- prevperiod = period;
}
return retval;
}
@@ -768,23 +785,21 @@ spi_dv_device_internal(struct scsi_reque
if (spi_dv_device_compare_inquiry(sreq, buffer, buffer, DV_LOOPS)
!= SPI_COMPARE_SUCCESS) {
- SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Domain Validation Initial Inquiry Failed\n");
+ SPI_PRINTK(starget, KERN_ERR, "Domain Validation Initial Inquiry Failed\n");
/* FIXME: should probably offline the device here? */
return;
}
/* test width */
if (i->f->set_width && spi_max_width(starget) && sdev->wdtr) {
- i->f->set_width(sdev->sdev_target, 1);
-
- printk("WIDTH IS %d\n", spi_max_width(starget));
+ i->f->set_width(starget, 1);
if (spi_dv_device_compare_inquiry(sreq, buffer,
buffer + len,
DV_LOOPS)
!= SPI_COMPARE_SUCCESS) {
- SPI_PRINTK(sdev->sdev_target, KERN_ERR, "Wide Transfers Fail\n");
- i->f->set_width(sdev->sdev_target, 0);
+ SPI_PRINTK(starget, KERN_ERR, "Wide Transfers Fail\n");
+ i->f->set_width(starget, 0);
}
}
@@ -792,7 +807,7 @@ spi_dv_device_internal(struct scsi_reque
return;
/* device can't handle synchronous */
- if(!sdev->ppr && !sdev->sdtr)
+ if (!sdev->ppr && !sdev->sdtr)
return;
/* see if the device has an echo buffer. If it does we can
@@ -807,16 +822,30 @@ spi_dv_device_internal(struct scsi_reque
/* now set up to the maximum */
DV_SET(offset, spi_max_offset(starget));
DV_SET(period, spi_min_period(starget));
+ /* try QAS requests; this should be harmless to set if the
+ * target supports it */
+ DV_SET(qas, 1);
+ /* Also try IU transfers */
+ DV_SET(iu, 1);
+ if (spi_min_period(starget) < 9) {
+ /* This u320 (or u640). Ignore the coupled parameters
+ * like DT and IU, but set the optional ones */
+ DV_SET(rd_strm, 1);
+ DV_SET(wr_flow, 1);
+ DV_SET(rti, 1);
+ if (spi_min_period(starget) == 8)
+ DV_SET(pcomp_en, 1);
+ }
if (len == 0) {
- SPI_PRINTK(sdev->sdev_target, KERN_INFO, "Domain Validation skipping write tests\n");
+ SPI_PRINTK(starget, KERN_INFO, "Domain Validation skipping write tests\n");
spi_dv_retrain(sreq, buffer, buffer + len,
spi_dv_device_compare_inquiry);
return;
}
if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
- SPI_PRINTK(sdev->sdev_target, KERN_WARNING, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
+ SPI_PRINTK(starget, KERN_WARNING, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
len = SPI_MAX_ECHO_BUFFER_SIZE;
}
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